Iron in water can cause:

• A. staining of plumbing fixtures
• B. staining clothes washed in the water
• C. the water have a bad appearance and taste
• D. all of the above

Answer: (D)

Iron in water can cause several practical issues: it can leave reddish-brown stains on plumbing fixtures and surfaces, it can stain clothes during washing, and it can give water a muddy appearance with a metallic taste. When iron is present, it tends to oxidize and precipitate, forming particles that cling to surfaces and fabrics. This oxidation also changes the water’s color and flavor, especially after the water has been exposed to air or heated. Because these effects can occur together, the option that includes all of them is the best choice.